had to completely replace a component in a massive project at my work recently because we forgor how it worked and had a newer different thing for it. it was so intertwined into that project that I practically had to do a ship of Theseus on it 😭😭😭😭
It's like saying someone had a really big victory or success. For example, imagine your team winning a game by a lot of points or someone doing really well in a competition. That's when people might talk about a "massive W."
excellent news =D